Automatic window-sash lock.



C. G. WESTLUND.

AUTOMATIC WINDOW SASH LOCK.

APPLICATION rmzn JULY 25, 1913.

1,127,835. Patented Feb. 9, 1915.

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CARL WESTLUND, OF WORCESTER, MASSACHUETTS.

AUTOMATIC WINDOW-SASI-I LOGK.

Application filed July 25, 1913.

T 0 all whom it may concern:

Be it known that I. CARL G. W'EsTLUNn, a citizen of the United States, residing at WVorcester, in the county of Worcester and C(mmonwealth of Massachusetts, have invented a new and useful Improvement in Automatic Window-Sash Locks, of which the following is a specification, accompanied by drawings forming a part of the same.

The object of my invention is to provide a sash lrck for automatically looking together the meeting rails of a window sash when the said rails are brought together by the closing of the window, thereby preventing the opening of the window. I accomplish this object by the construction and arrangement of parts as hereinafter described and illustrated in the accompanying drawings, in which- Figure 1 represents a top view of a portion of the meeting rails of the upper and lower sash of a window, having my improved automatic window lock applied thereto, shown in plan view, the parts being represented in position to draw the meeting rails together. Fig. 2 is a side view of my window lock applied to the meeting rails of the window sash, with the parts in the position as shown in Fig. 1. Fig. 3 is a plan view of my improved window lock,shown partly in section, with the latch detached from the cam plate, but in position to pre vent the vertical movement of either the upper or lower sash of the window. Fig. 4 is a side view with the parts in the position shown in Fig. 3. Fig. 5 is a plan view with the latch pushed back in position to allow either the upper window sash or the lower window sash to be moved vertically. Fig. 6 is a side viewof my improved window lock, with the meeting rails in different planes, illustrating the movement of the different parts of the window lock in the operation of closing either the upper or lower sash.

Similar reference letters and figures refer to similar parts in the different views.

Referring to the accompanying drawings, 1 denotes the lower meeting rail of the upper window sash and 2 the upper meeting rail of the lower window sash. Attached to the top of the meeting rail 1 is a plate 3 upon which is pivotally supported the latch 4, capable of swinging upon the pin 5, said pin being held in the plate 3 and in a bracket 6 formed integrally with the plate 3. In-

Specification of Letters Patent.

PatentedFeb.9,1915.

Serial No. 781,096.

closed beneath the bracket 6 is a flat blade spring 7 bent around a pin 8 by which the blade spring is held in position. One end 9 of the blade spring bears against the rear wall of the bracket 6 and the opposite end 10 bears against the latch 4.

In the normal position of the latch 4 the end 10 of the blade spring rests against the side 11 of the latch, serving to hold the latch 4 in its normal position, as represented in Fig. 3. In this normal position of the latch 4 a projection 12 thereof extends over a plate 13 attached to the meeting rail 2, thereby preventing the lowering of the up per sash or raising the lower sash. Upon the plate 13 is a curved rib forming a cam 14. The latch 4 is provided with a thumb piece 15 by which the latch may be swung upon its pivot 5 into the position shown in Fig. 1.

lVhen the latch 4 is moved from the position shown in Fig. 3 to that shown in Fig. 1, the projecfiirn 12 is moved around the cam 14 and caused to draw the meeting rails together. In this position the end 10 of the blade spring 7 bears against the end 16 of the latch 4 holding the latch in position. When the latch 4 is moved back and released from the cam 14it is normally held in the position shown in Fig. 3, with the projection 12 overlapping the plate 13 upon the meeting rail 2 and preventing the vertical movement of the meeting rails, thereby automaticallv locking the window sash.

When it is desired to lower the upper sash or to raise the lower sash the latch 4 is pushed back into the position shown in Fig. 5 far enough to cause the projection 12 to free the meeting rail 2, thereby allowing either the upper or lower sash to be raised or lowered.

Depending from the rear edge of the plate 13 and integral therewith is a plate 17 lying in a cut-away portion of the meeting rail 2 and in alinement with the projection 12 on the latch 4. The object of the plate 17 is to form a metallic contacting surface for the projection 12 as the meeting rails are brought together. The lower end 18 of the plate 17 is rounded and if necessary the plate 17 is slightly inclined from a vertical plane to act as a cam surface when in contact with the tip of the projection 12 to cause the latch 4 to be pushed back into the position shown in Fig. 5, in which position the blade spring 7 will bear "against a corner 19 on the latch 4 and at one side of the pivot 5, so that when the meeting rails are brought together the tension of the spring 7 will bring the latch 4 into the position shown in Figs. 3 and 4:. 1

In the operation of permanently and positively locking the two sections of the window together by movement of the latch 4 from the position shown'in Figs. 3 or 5 to the position shown in Fig. 1, it will be noted that the cam 14', by reason of its peculiar formation, materially assists, not only in drawing. the meeting rails into closer contact along their contacting faces, but also in bringing them into a common horizontal plane, whereby an efiicient and weather tight joint is secured. To this end, the face of the cam is given a decided pitch or in cline, as clearly shown in Figs. 2, i and 6 of the drawings, the low point of said face being adjacent the inner edge of plate 13 and the high point being at the end of the swinging movement of latch 4, as shown in Fig. 1. It follows,.therefore, if either sash is not entirely closed prior to operation of the latch, that the wedging action between the lower face of the projection 12 and the said inclined face of the cam, as the former is moved over the latter, will effect a complete closure of both sashes, simultaneously Zontal plane.

with the movement of the latch into locking position.

I claim,

In a window sash lock, the combination with the lower meeting rail of an upper sash and the upper meeting rail of a lower sash, of a spring pressed latch piv-otally supported on said first meeting rail, said latch provided with a wedge-shaped projection having a substantially horizontal under face and an intersecting downwardly inclined upper face, yieldingly extended beyond the edge of the first meeting rail in the normal unlocked position of said latch and adapted to be struck by said second meeting rail as the lower sash is moved into closing position, to depress said latch, and a plate carried by said second meeting rail, and provided with a segmental cam track having an inclined bottom wall for cooperation with the under face of said projection and an undercut side wall for cooperation with the inclined upper face of said projection, whereby the swinging of the latch into locking position draws the two meeting rails toward each other in a common hori- CARL G. WESTLUND. Witnesses:

PENELOPE COMBERBACH,

NELLIE Q'VVHALEN.

Copies of this patent may be obtained for five cents each. by addressing the Commission-er of Patents,

Washington, D. C. 

